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...eeded|date=May 2010}} This is credited to an increase in dopamine, because mania can be reduced by dopamine-blocking anti-psychotics.<ref>http://bipolar.abo ...ccordingly, decreased levels of dopamine have been associated with painful symptoms that frequently occur in [[Parkinson's disease]].<ref>Brefel-Courbon C, Pay

...D₂ receptor. This has been suggested to account for most of the psychotic features.<ref>{{cite journal |author=Giannini AJ, Nageotte C, Loiselle RH, ...02.003 | pmid = 15653257 | accessdate = 2006-09-29}}</ref> It also induces symptoms in humans that are virtually indistinguishable from schizophrenia.<ref>{{ci